Why does he do that?

My boyfriend always asks me "what im up to" but when i tell him and ask him what he's doing 3 things happen1. He answers2. He skips to another subject3. He doesn't answer at all.I think it's pretty weird.. But maybe it doesn't mean anything it just makes me wonder sometimes.what do you guys think?

Ya I get ya. Just don't be paranoid. It'll drive you insane. Instead if it really bothers you just have a sit down and chat about okay? I mean if there's a reason you aren't trusting him than maybe there's something you both need to talk about. If not let him live his life. You have to be happy as well. So don't waste your time wondering about the what ifs